Table 5.

Observed and Expected Numbers of Deaths Due to Malignant Lymphoma Among Male Atomic Bomb Survivors (1950–2000) and Male Workers at the Savannah River Site (1950–2002), by Radiation Dose, Japan and South Carolina^a

Assumed Lag and Cohort	Radiation Dose, Sv
	<0.005	0.005–<0.10	0.10–<0.20	0.20–<0.50	0.50–<1	1–<2	≥2
5-year lag
Atomic bomb survivorsb
No. of deaths observed	32	29	8	11	3	5	2
Obs/Exp ratioc	0.80	0.97	1.33	1.61	0.72	2.04	2.60
Mean dose, Sv	0.001	0.032	0.141	0.322	0.721	1.340	2.392
Person-years of follow-up	260,641	195,354	38,255	45,932	28,566	16,674	5,937
Savannah River Site workers
No. of deaths observed	20	24	7	5	0	0	0
Obs/Exp ratio	0.77	1.01	1.78	2.14
Mean dose, Sv	0.001	0.028	0.142	0.266
Person-years of follow-up	305,131	181,767	25,961	12,830	0	0	0
10-year lag
Atomic bomb survivors
No. of deaths observed	27	27	8	11	3	5	2
Obs/Exp ratio	0.73	0.97	1.44	1.73	0.78	2.19	2.73
Mean dose, Sv	0.001	0.032	0.141	0.322	0.722	1.338	2.392
Person-years of follow-up	213,808	160,274	31,330	37,840	23,545	13,827	4,926
Savannah River Site workers
No. of deaths observed	21	24	6	5	0	0	0
Obs/Exp ratio	0.77	1.05	1.60	2.35
Mean dose, Sv	0.001	0.028	0.141	0.264
Person-years of follow-up	344,948	149,706	21,197	9,840	0	0	0

Abbreviations: Exp, expected; Obs, observed.

^aBecause of rounding, some column totals for person-time differ slightly from the sums of rows.

^bJapanese males who were aged 15–64 years and present in Hiroshima or Nagasaki at the time of the bombings.

^cRatio of the number of deaths observed to the number of deaths expected.